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Ps2 won't recognize my Ps1 memory cards, any help?

I have the original (bulky or fat) ps2, that has always recognized my Ps1 memory cards, up until a few days back. I have tried 4 different Ps1 memory cards, my Ps2 recognize none of them.
I have a Ps1 at my dad's home, and it recognizes every one of the 4.
Is it possible to make Ps2 recognize the Ps1 memory cards again?